Boiler



March 31, 1931.

J. F. DlcKsoN 1,798,247

BOILER Filed May 25, 1930 Il. i I: "Wil, Ml

Patented Mar. 31, 1931 Unire srarss PATENT `orrlcs JOSEPH F. DCKSON, F KEWANEE, ILLNOIS, ASSIGNOR TO KEWANEE BOILER COR- PORATON, OF KEWANEE, ILLINOIS, A CORPORATION OF DELAWARE BOILER Application filed May 23,

ln down-draft steam-boilers, difficulty and trouble have heretofore been experienced in installing them in places where space is an important factor, owing to their height.

Such boilers incorporate an upper, watertube fuel-grate and below that an ordinary grate with an ash-pit below it, front doors at suitable levels giving access to both grates and to the pit.

Above the ash-pit door and substantially on a level with the lower grate, the hollow front furnace wall has been provided with a mud-ring which spaces the metalv sheets of the wall apart and the uniting rivetsextend l through the plates and ring.

inasmuch as such solid mud-ring tends to become quite hot under the heat developed in the furnace, it has been necessary, heretofore, to build the furnace or boiler walls with a substantial depth of water space between the mud-ring and the front door. above it, whose doorway leads to the under or lower grate.

This has necessarily meant that the height of the boiler must include several inches to afford the needed water protection above the mud-ring, and, where space above the boiler is an important factor, which is usually the case, because of the room needed for piping, these height inches have a prominent and important bearing on the situation.

One of the leading objects and prime aims of the present invention is to provide a boiler or furnace structure of this character which can be made of less height than customary,

' and this is accomplished by adopting the principles of this invention by supplying a construction which embodies or incorporates no such mud-ring and which, ther-clore, permits the elimination of the protective water space i referred to, with the result that complete boiler is several inches less in its vertical dimension than has heretofore been thought possible.

'lo permit those skilled and trained in this art to fully and completely understand the invention, in the accompanying drawing, forming a part of this speciication, l have illustrated in detail a present, preferred embodiment of the invention, and for simplicity 1930. Serial No. 454,844.

like reference characters have been used to designate the same parts in the two views.

In this drawing Figure l is a fragmentary, longitudinal, vertical section through the boiler with parts omitted; and

Figure 2 is a front elevation of the same portion of the structure.

Referring to the drawing, it will be observed that the improved and novel boiler or furnace includes a corrugated-metal crownsheet ll, affording below it a compartment or chamber to accommodate the fuel resting on a slightly-inclined water-grate, composed of a suitable number of forwardly-sini ing water-tubes l2 connected at their rear ends to a header or manifold 13 supporting a back lire-brick or other refractory wall 14 and joined at their forward ends to the interior ofthe hollow, front wall described below.

he lower-grate 15 of any approved or appropriate construction is carried at its rear end on a transverse angle-bar 1G associated with a cross-wall 17, its front end being supported on a similar, transverse angle-bar 18 mounted on castings 19, 19 at the front of the ash-pit 2l below such second or under grate.

The front wall of the boiler is hollow and is filled with water undergoing heating, such wall comprising an inner, upright, metal plate 22 and a spaced outer plate 23 apertured in register at 2li and 25, respectively, to provide a fire doorway leading to the fuel-chamber above the grate-tubes l2, th-e plates around such doorway having an appropriately-shaped spacing plate 26 between them corresponding to the contour or outline of the doorway, such interposed marginal plate being welded to the inner surfaces of the pair of main plates.

This doorway is fitted with one or more lire-doors equipped with movable or adjustable draft-doors of the customary construction, but since these form no part of the present invention they have not been illustrated.

At their lower margins, the spaced wall plat-es 22 and 23 are cut away in register at 27 and 28, respectively, to afford a lower grate doorway, the bottom margin of the exterior plate 23 at opposite sides of such doorway being inturned at 29 to form horizontallyaligned flanges 3l, the inner edges of which are welded to the adjacent face of the companion plate 22.

The other walls of the furnace or boiler are constructed in similar manner to the front wall, but, of course, without the doorways reterred to.

rlie top and sides ot the doorway 27, Q8 are 'formed by an arch plate 32 between and welded to the two companion wall plates around the tops and sides, and also welded to the ends ot the flanges 31, but such plate 32 does not extend across the bottom of the margins or" the openings of the speciied plates forming the wall.

A iront tace-plate 33, ot the shape shown in Figure Q, apertured at 34 in register with the lower-grate doorway 27, 28 and it also has a second opening 35 forming a doorway to the ash-pit 2l, such plate being fastened or secured at 3G, 3G by bolts or rivets in any approved or convenient manner to the corner castings 19, 19, and such exterior plat-e is equipped with suitable hinged-doors 37 and 38 co-operating with the doorways.

From the foregoing, it will be apparent that the absence of the customary mud-ring permits the elimination of the required water space above it to prevent undue or dangerous rise in temperature of the metal parts, and, accordingly, the bottom bord-er of the intermediate doorway 27, 28, 34C, is substantially on a level with the lower grate 15, thus permitting material or substantial reduction in the total height of the oiler.

In the accompanying` drawing, I have presented a certain, desirable embodiment of the invention, which is deemed suitable for the realization of the objects to be attained, but it will be understood by those skilled in this art that the invention is not limited to the particular and specific details shown, and may be modiiied within the skill of the mechanic, provided the construction incorpo rates the fundamental principles of the invenA tion, as defined by the appended claim, and which are to be limited in their interpretation in so far only as such restrictions are therein speciiied.

I claim:

lu a down-draft furnace, the combination ot an upper water-tube fuel-grate, a second grate below said upper grate, an asliepit below said second grate, a housing enclosinn' said grates and ash-pit including a front-wall section composed ot a pair of spaced upright metal plates providing a water space between them, the bottoms or" said plates being substantially on a level with said second grate, the lower marginal portion of one of said pair of plates being bent over to form the bottom wall ot ,said water space and welded to the companion plate, a front plate for said ash-pit having an upward Iextension around the sides and top oi said doorway, said front plate having a doorway for said ash-pit and a lower-grate doorway in register with said front-wall section doorway, a door hinged on said front plate co-operating with said ash-,pit doorway, and a second door hinged on said front plate co-acting with said lower-grate doorway.

ln witness whereof l have hereunto set my hand. V V p JOSEPH F. DICKSON. 

